Unit 1 Review H. Chem 23-24

Front

What is an isotope?

Back

Isotopes are variants of a chemical element that have the same number of protons but different numbers of neutrons, resulting in different atomic masses.

Front

What is the average atomic mass of an element?

Back

The average atomic mass is the weighted average of the masses of an element's isotopes, taking into account their relative abundances.

Front

How do you calculate the average atomic mass of an element with multiple isotopes?

Back

Multiply the mass of each isotope by its relative abundance (as a decimal), then sum these values.

Front

What is the significance of the atomic number?

Back

The atomic number indicates the number of protons in an atom and determines the element's identity.

Front

How many neutrons are in an isotope?

Back

The number of neutrons can be found by subtracting the atomic number from the mass number of the isotope.

Front

What is the mass number of an isotope?

Back

The mass number is the total number of protons and neutrons in the nucleus of an atom.

Front

What is the difference between atomic mass and mass number?

Back

Atomic mass is the weighted average of all isotopes of an element, while mass number is the total count of protons and neutrons in a specific isotope.

Front

How do you measure liquid volume accurately?

Back

Use a graduated cylinder or a measuring cup and read the measurement at eye level to the bottom of the meniscus.

Front

What is the significance of significant figures in measurements?

Back

Significant figures indicate the precision of a measurement and help convey the certainty of the data.

Front

What is the formula for calculating average atomic mass given isotopes and their abundances?

Back

Average Atomic Mass = (mass1 * abundance1) + (mass2 * abundance2) + ...